[PATCH 08/15] rtc: sun6i: Expose internal oscillator through device tree

Chen-Yu Tsai
2018-11-28T09:30:06Z

The bindings have been updated to expose the RTC's internal oscillator,
for some SoCs that have it directly feeding the PRCM block. The changes
include the index 2 for the clock outputs, as well as the clock output
names.

This patch adds the internal oscillator to the list of clocks exposed
through of_clk_add_hw_provider(), and also have the driver optionally
fetch the name of the clock from the device tree if it's available.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
drivers/rtc/rtc-sun6i.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
index 62ed9ce53d8c..273ab7fbbbe3 100644
--- a/drivers/rtc/rtc-sun6i.c
+++ b/drivers/rtc/rtc-sun6i.c
@@ -220,6 +220,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
.ops = &sun6i_rtc_osc_ops,
.name = "losc",
};
+ const char *iosc_name = "rtc-int-osc";
const char *clkout_name = "osc32k-out";
const char *parents[2];

@@ -228,7 +229,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
return;

rtc->data = data;
- clk_data = kzalloc(struct_size(clk_data, hws, 2), GFP_KERNEL);
+ clk_data = kzalloc(struct_size(clk_data, hws, 3), GFP_KERNEL);
if (!clk_data) {
kfree(rtc);
return;
@@ -253,8 +254,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
if (!of_get_property(node, "clocks", NULL))
goto err;

+ of_property_read_string_index(node, "clock-output-names", 2,
+ &iosc_name);
rtc->int_osc = clk_hw_register_fixed_rate_with_accuracy(NULL,
- "rtc-int-osc",
+ iosc_name,
NULL, 0,
rtc->data->rc_osc_rate,
300000000);
@@ -290,9 +293,10 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
return;
}

- clk_data->num = 2;
+ clk_data->num = 3;
clk_data->hws[0] = &rtc->hw;
clk_data->hws[1] = __clk_get_hw(rtc->ext_losc);
+ clk_data->hws[2] = rtc->int_osc;
of_clk_add_hw_provider(node, of_clk_hw_onecell_get, clk_data);
return;

--
2.20.0.rc1